ITP Logo

Bolboschoenus robustus

Species category

Weed

Common name

sturdy bulrush

Diagnostic characters

Planting unit

AcheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat.

Shape

Broadly obovateObovate:
Inverted egg shaped with apical end the broadest.

Size

  • Length: 2.5 mm
  • Width: 2.5 mm
  • Thickness: 1 mm

Color

Dark brown

Texture

Smooth

Other structures

Remnants of the scar and style

Identification notes

This species (Bulboschoenus robustus) is very similar to Schoenoplectus americanus except for the difference in color. It also takes on a rounded triangular appearance.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Cyperaceae

Valid name

Bolboschoenus robustus (Pursh) Soják

Synonyms

Scirpus maritimus L. var. agonus (Fernald) Beetle
Scirpus maritimus L. var. macrostachyus Michx.
Scirpus robustus Pursh
Schoenoplectus robustus (Pursh) M.T. Strong

From Left to Right: 1.  Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus lacustris . Dark brown achenes.
From Left to Right: 1. Bolboschencus robustus 2. Schoenoplectus americanus 3. Schoenoplectus lacustris. Dark brown achenes.
Bolboschoenus robustus. Smooth achenes with remnants of scar and style.
Bolboschoenus robustus. Smooth achenes with remnants of scar and style.